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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 728 · 40 questions
TalentJR

The method (LCM, then take away): Find the LCM of the two bottom numbers. Change each fraction to that bottom number. Subtract the tops, keep the bottom, and simplify.

NameDateTime takenScore ___ / 40
  1. 1.7/10 − 2/3 =
  2. 2.1/2 − 1/9 =
  3. 3.3/4 − 4/7 =
  4. 4.2/3 − 1/5 =
  5. 5.1/2 − 3/7 =
  6. 6.A tank is 5/6 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  7. 7.Diya has a ribbon 1/3 m long and cuts off 1/9 m. How long is the ribbon now (in m)? =
  8. 8.A bottle has 1/2 litre of juice. Diya drinks 4/9 litre. How much juice is left (in litres)? =
  9. 9.A bottle has 7/8 litre of juice. Diya drinks 1/3 litre. How much juice is left (in litres)? =
  10. 10.3/4 − 1/5 =
  11. 11.Sara has a ribbon 3/5 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  12. 12.Kabir has a ribbon 5/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  13. 13.5/6 − 3/8 =
  14. 14.A bottle has 2/5 litre of juice. Sara drinks 1/4 litre. How much juice is left (in litres)? =
  15. 15.A tank is 1/5 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  16. 16.A tank is 1/4 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  17. 17.1/2 − 1/5 =
  18. 18.A bottle has 4/5 litre of juice. Kabir drinks 3/10 litre. How much juice is left (in litres)? =
  19. 19.1/2 − 4/9 =
  20. 20.Meera has a ribbon 1/2 m long and cuts off 3/8 m. How long is the ribbon now (in m)? =
  21. 21.A bottle has 7/9 litre of juice. Anaya drinks 1/2 litre. How much juice is left (in litres)? =
  22. 22.3/4 − 3/7 =
  23. 23.2/3 − 2/9 =
  24. 24.2/5 − 3/10 =
  25. 25.A tank is 3/4 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  26. 26.A bottle has 1/2 litre of juice. Rohan drinks 1/5 litre. How much juice is left (in litres)? =
  27. 27.6/7 − 1/2 =
  28. 28.7/8 − 2/3 =
  29. 29.Anaya has a ribbon 2/5 m long and cuts off 3/10 m. How long is the ribbon now (in m)? =
  30. 30.A bottle has 1/3 litre of juice. Tara drinks 2/7 litre. How much juice is left (in litres)? =
  31. 31.5/7 − 1/3 =
  32. 32.A tank is 9/10 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  33. 33.A bottle has 1/2 litre of juice. Vihaan drinks 4/9 litre. How much juice is left (in litres)? =
  34. 34.A tank is 9/10 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  35. 35.9/10 − 1/4 =
  36. 36.3/4 − 1/10 =
  37. 37.2/3 − 3/8 =
  38. 38.A tank is 5/9 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  39. 39.A tank is 3/4 full of water. Then water filling 2/7 of the tank is used. What fraction of the tank is full now? =
  40. 40.2/3 − 1/6 =

Answer key

  1. 1/30
  2. 7/18
  3. 5/28
  4. 7/15
  5. 1/14
  6. 13/18
  7. 2/9
  8. 1/18
  9. 13/24
  10. 11/20
  11. 1/10
  12. 8/21
  13. 11/24
  14. 3/20
  15. 1/10
  16. 1/20
  17. 3/10
  18. 1/2
  19. 1/18
  20. 1/8
  21. 5/18
  22. 9/28
  23. 4/9
  24. 1/10
  25. 5/8
  26. 3/10
  27. 5/14
  28. 5/24
  29. 1/10
  30. 1/21
  31. 8/21
  32. 7/30
  33. 1/18
  34. 7/10
  35. 13/20
  36. 13/20
  37. 7/24
  38. 1/18
  39. 13/28
  40. 1/2

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